\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx}
\setCJKmainfont{Noto Serif CJK SC}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usepackage{wasysym}
\usetikzlibrary{patterns, calc}
\usetikzlibrary {decorations.pathmorphing, decorations.pathreplacing, decorations.shapes,}
\begin{document}
\small
\begin{tikzpicture}[>=latex,scale=1.0]
  \fill [cyan!40] (-3,-1.4) rectangle (3,0);
  \node at (1,0.5){空气};
  \draw[densely dashdotted] (0,-1)--(0,1);
  \draw(-3,0)--(3,0);
  \draw[->, very thick] (0,0)--(-55:1.0); 
  \draw[very thick] (150:2)--(0,0)--(-55:1.7);
  \draw[->, very thick] (150:2)--(150:1.0); 
  \draw (.5,0) arc (0:-55:.5) node [midway,right] {\ang{55}};
  \draw (-1,0) arc (180:150:1) node [midway,left] {\ang{30}};
\end{tikzpicture}
\end{document}